I did the energy performance certificate online via Immobilienwerker because I didn't feel like making countless phone calls. Overall, it went really smoothly. The process is relatively clear, even if I had to think briefly in two places about what exactly was meant (in the building data). What I found good: You get hints if something seems implausible, and you can look at the entries again at your leisure before you send them off. The support team was available to me by email and responded within a day - not in 5 minutes, but completely ok. In the end, the energy performance certificate arrived without any problems, the format was right, and I was able to pass it on straight away. The price is not "super cheap", but you save time. A few texts on the page could be a little easier to understand, but overall it was a solid experience. I would use it again if I needed another one.
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